Safety

Question 1

Who are the main regulatory bodies in MRI safety? (4 marks)

Answer 1

HPA

ICNIRP

MHRA

IEC

Question 2

What are the dangers from MRI and why? (15 marks)

Answer 2

• Main B0 field = projectile risk and implanted devices such as pacemakers
• B1 field = RF heating of implanted devices and patients with thermo-reg issues, and if patients form loops with their arms and legs
• Acoustic noise from switching the field gradients
• Peripheral nerve stimulation can cause pain due to rapid gradient switching.
• Asphixation and cold burns from a quench,

Question 3

Who publishes guidance on local rules and safety? (1 mark)

Answer 3

MHRA